Download or read book Performance Assessment of a Desiccant Cooling System in a CHP combined Heat and Power Application Incorporating an IC internal Combustion Engine written by and published by . This book was released on 2006 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Performance of a desiccant cooling system was evaluated in the context of combined heat and power (CHP). The baseline system incorporated a desiccant dehumidifier, a heat exchanger, an indirect evaporative cooler, and a direct evaporative cooler. The desiccant unit was regenerated through heat recovery from a gas-fired reciprocating internal combustion engine. The system offered sufficient sensible and latent cooling capacities for a wide range of climatic conditions, while allowing influx of outside air in excess of what is typically required for commercial buildings. Energy and water efficiencies of the desiccant cooling system were also evaluated and compared with those of a conventional system. The results of parametric assessments revealed the importance of using a heat exchanger for concurrent desiccant post cooling and regeneration air preheating. These functions resulted in enhancement of both the cooling performance and the thermal efficiency, which are essential for fuel utilization improvement. Two approaches for mixing of the return air and outside air were examined, and their impact on the system cooling performance and thermal efficiency was demonstrated. The scope of the parametric analyses also encompassed the impact of improving the indirect evaporative cooling effectiveness on the overall cooling system performance.
Download or read book Performance Assessment of a Desiccant Cooling System in a CHP Application with an IC Engine written by and published by . This book was released on 2005 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Performance of a desiccant cooling system was evaluated in the context of combined heat and power (CHP). The baseline system incorporated a desiccant dehumidifier, a heat exchanger, an indirect evaporative cooler, and a direct evaporative cooler. The desiccant unit was regenerated through heat recovery from a gas-fired reciprocating internal combustion engine. The system offered sufficient sensible and latent cooling capacities for a wide range of climatic conditions, while allowing influx of outside air in excess of what is typically required for commercial buildings. Energy and water efficiencies of the desiccant cooling system were also evaluated and compared with those of a conventional system. The results of parametric assessments revealed the importance of using a heat exchanger for concurrent desiccant post cooling and regeneration air preheating. These functions resulted in enhancement of both the cooling performance and the thermal efficiency, which are essential for fuel utilization improvement. Two approaches for mixing of the return air and outside air were examined, and their impact on the system cooling performance and thermal efficiency was demonstrated. The scope of the parametric analyses also encompassed the impact of improving the indirect evaporative cooling effectiveness on the overall cooling system performance.
Download or read book Combined Cooling Heating and Power Systems written by Yang Shi and published by John Wiley & Sons. This book was released on 2017-09-05 with total page 195 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive review of state-of-the-art CCHP modeling, optimization, and operation theory and practice This book was written by an international author team at the forefront of combined cooling, heating, and power (CCHP) systems R&D. It offers systematic coverage of state-of-the-art mathematical modeling, structure optimization, and CCHP system operation, supplemented with numerous illustrative case studies and examples. CCHP systems are an exciting emerging energy technology offering significant economic and environmental benefits. Combined Cooling, Heating, and Power Systems: Modelling, Optimization, and Operation is a timely response to ongoing efforts to maximize the efficiency of that technology. It begins with a survey of CCHP systems from the technological and societal perspectives, offering readers a broad and stimulating overview of the field. It then digs down into topics crucial for optimal CCHP operation. Discussions of each topic are carefully structured, walking readers from introduction and background to technical details. A set of new methodologies for the modeling, optimization and control of CCHP systems are presented within a unified framework. And the authors demonstrate innovative solutions to a variety of CCHP systems problems using new approaches to optimal power flow, load forecasting, and system operation design. Provides a comprehensive review of state-of-the-art of CCHP system development Presents new methodologies for mathematical modeling, optimization, and advanced control Combines theoretical rigor with real-world application perspectives Features numerous examples demonstrating an array of new design strategies Reflects the combined experience of veteran researchers in the field whose contributions are well recognized within the energy community Offers excellent background reading for students currently enrolled in the growing number of courses on energy systems at universities worldwide Timely, authoritative, and offering a balanced presentation of theory and practice, Combined Cooling, Heating, and Power Systems: Modelling, Optimization, and Operation is a valuable resource forresearchers, design practitioners, and graduate students in the areas of control theory, energy management, and energy systems design.
Download or read book Promising Advances in Desiccant Cooling written by Terry R. Penney and published by . This book was released on 1985 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Desiccant Assisted Cooling written by Carlos Eduardo Leme Nóbrega and published by Springer Science & Business Media. This book was released on 2013-11-19 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: The increasing concern with indoor air quality has led to air-quality standards with increased ventilation rates. Although increasing the volume flow rate of outside air is advisable from the perspective of air-quality, it is detrimental to energy consumption, since the outside air has to be brought to the comfort condition before it is insufflated to the conditioned ambient. Moreover, the humidity load carried within outside air has challenging HVAC engineers to design cooling units which are able to satisfactorily handle both sensible and latent contributions to the thermal load. This constitutes a favorable scenario for the use of solid desiccants to assist the cooling units. In fact, desiccant wheels have been increasingly applied by HVAC designers, allowing distinct processes for the air cooling and dehumidification. In fact, the ability of solid desiccants in moisture removal is effective enough to allow the use of evaporative coolers, in opposition to the traditional vapor-compression cycle, resulting in an ecologically sound system which uses only water as the refrigerant. Desiccant Assisted Cooling: Fundamentals and Applications presents different approaches to the mathematical modeling and simulation of desiccant wheels, as well as applications in thermal comfort and humidity controlled environments. Experts in the field discuss topics from enthalpy, lumped models for heat and mass transfer, and desiccant assisted radiant cooling systems, among others. Aimed at air-conditioning engineers and thermal engineering researchers, this book can also be used by graduate level students and lecturers in the field.
Download or read book Desiccant Cooling Systems written by and published by Charles Nehme. This book was released on with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ever-increasing demand for efficient, sustainable, and environmentally friendly cooling solutions has led to significant advancements in the field of HVAC technology. Among these innovations, desiccant cooling systems have emerged as a promising alternative to traditional air conditioning methods. By harnessing the principles of moisture absorption and evaporation, desiccant cooling systems offer precise control over indoor environments, reduced energy consumption, and minimized environmental impact. This comprehensive guide aims to explore the intricacies of desiccant cooling systems, providing readers with a deep understanding of the fundamental principles, diverse applications, challenges faced, and future trends in this field. Through detailed chapters, we delve into the psychrometric processes, types of desiccants, system components, configurations, performance evaluation, real-world applications, and the innovative solutions that shape the landscape of desiccant cooling technology. As the world grapples with the challenges of climate change and the imperative to reduce greenhouse gas emissions, the significance of sustainable cooling technologies cannot be overstated. Desiccant cooling systems stand at the forefront of this movement, offering a path toward energy efficiency, environmental responsibility, and enhanced indoor comfort. We invite readers, ranging from HVAC professionals and engineers to researchers and environmentally conscious individuals, to embark on this journey through the realms of desiccant cooling. By embracing the knowledge presented within these pages, we can collectively contribute to a greener and more sustainable future.
Download or read book Desiccant Cooling System Performance Studies and Applications written by Shailendra Kumar Shukla and published by LAP Lambert Academic Publishing. This book was released on 2013 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the drastically change in climatic conditions in recent years, demand for air conditioning is spreading all over the world. This causes a primary consumption of energy in high quantity. In order to provide the best indoor air quality and thermal comfort with minimum consumption of energy, the hybrid desiccant cooling system is one of the options in our daily life. This work presents results of experimental and simulation study of a hybrid desiccant cooling system for air conditioning applications using two different desiccants (Lithium chloride and Calcium Chloride).
Download or read book Desiccant Cooling Systems written by Charles Nehme and published by Independently Published. This book was released on 2023-11 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ever-increasing demand for efficient, sustainable, and environmentally friendly cooling solutions has led to significant advancements in the field of HVAC technology. Among these innovations, desiccant cooling systems have emerged as a promising alternative to traditional air conditioning methods. By harnessing the principles of moisture absorption and evaporation, desiccant cooling systems offer precise control over indoor environments, reduced energy consumption, and minimized environmental impact. This comprehensive guide aims to explore the intricacies of desiccant cooling systems, providing readers with a deep understanding of the fundamental principles, diverse applications, challenges faced, and future trends in this field. Through detailed chapters, we delve into the psychrometric processes, types of desiccants, system components, configurations, performance evaluation, real-world applications, and the innovative solutions that shape the landscape of desiccant cooling technology. As the world grapples with the challenges of climate change and the imperative to reduce greenhouse gas emissions, the significance of sustainable cooling technologies cannot be overstated. Desiccant cooling systems stand at the forefront of this movement, offering a path toward energy efficiency, environmental responsibility, and enhanced indoor comfort. We invite readers, ranging from HVAC professionals and engineers to researchers and environmentally conscious individuals, to embark on this journey through the realms of desiccant cooling. By embracing the knowledge presented within these pages, we can collectively contribute to a greener and more sustainable future. Charles Nehme
Download or read book Modelling Internal Combustion Engine powered Desiccant Cooling Systems written by James D. Kleiser and published by . This book was released on 1987 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of the Seasonal Performance of Hybrid Liquid Desiccant Cooling Systems written by Friedrich Sick and published by . This book was released on 1986 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Assessment of Desiccant Cooling and Dehumidification Technology written by and published by . This book was released on 1992 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: Desiccant systems are heat-actuated cooling and dehumidification technology. With the recent advances in this technology, desiccant systems can now achieve a primary energy coefficient of performance (COP) between 1.3 and 1.5, with potential to go to 1.7 and higher. It is becoming one of the most promising alternatives to conventional cooling systems. Two important and well-known advantages of desiccant cooling systems are that they are CFC free and they can reduce the electricity peak load. Another important but lesser-known advantage of desiccant technology is its potential for energy conservation. The energy impact study in this report indicated that a possible 13% energy saving in residential cooling and 8% in commercial cooling is possible. Great energy saving potential also exists in the industrial sector if industrial waste heat can be used for desiccant regeneration. The latest study on desiccant-integrated building heating, ventilating, and air conditioning (HVAC) systems indicated that the initial cost for the conventional cooling equipment was greatly reduced by using desiccant technology because of downsized compressors, fans, and ductworks. This cost reduction was more than enough to offset the cost of desiccant equipment. Besides, the system operation cost was also reduced. All these indicate that desiccant systems are also cost effective. This study provides an updated state-of-the-art assessment forsiccant technology in the field of desiccant materials, systems, computer models, and theoretical analyses. From this information the technology options were derived and the future research and development needs were identified. Because desiccant technology has already been applied in the commercial building sector with very encouraging results, it is expected that future market breakthroughs will probably start in this sector. A market analysis for the commercial building application is therefore included.
Download or read book An Analysis of Hybrid Desiccant Cooling Systems in Supermarket Applications written by Philip Richard Burns and published by . This book was released on 1985 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of Hybrid Liquid Desiccant Cooling Systems written by Thomas Karl Buschulte and published by . This book was released on 1984 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High Performance Solar Desiccant Cooling Systems written by Dennis Schlepp and published by . This book was released on 1984 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents an assessment of the current status of solar desiccant cooling and makes recommendations for continued research to develop high performance systems competitive with conventional cooling systems. Solid desiccant, liquid desiccant, and hybrid systems combining desiccant dehumidifiers with vapor compressor units are considered.
Download or read book High Performance Solar Desiccant Cooling Systems written by Dennis Schlepp and published by . This book was released on 1984 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents an assessment of the current status of solar desiccant cooling and makes recommendations for continued research to develop high performance systems competitive with conventional cooling systems. Solid desiccant, liquid desiccant, and hybrid systems combining desiccant dehumidifiers with vapor compressor units are considered.
Download or read book Evaluation of Heat Rejection Strategies for Liquid Desiccant Air conditioning Systems written by and published by . This book was released on 2015 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: The increased demand for space cooling and the resulting summer peak in electrical demands are motivating research into thermally-driven air-conditioning systems that can use renewable or waste heat. One promising technology is the use of a Liquid Desiccant Air-Conditioning (LDAC). An evaporative cooling tower (ECT) was used as a cooling device to reject the heat from a LDAC at Queen's University. Investigation of the ECT showed significant power consumption and ineffective operation in humid conditions which contributed to the low electrical and thermal coefficients of performance (COPE and COPT). Therefore, the present study was undertaken to identify and evaluate alternative heat rejection strategies that can provide a better thermal and electrical system performance. The relationship between the relative humidity and the ambient air temperature at a variety of cooling water temperatures was modelled using TRNSYS, a transient simulation program, as the first stage of the study. To find the most promising heat rejection technologies, available cooling methods were reviewed and two were selected (based on the results of the first phase of the study), namely, (i) a cooling water storage (CWS) system and (ii) a ground-source heat exchanger (GSHX) system. These were simulated and evaluated in detail. Finally, an experimental investigation of a stratified cooling water storage tank (SCWS) and night cooling water storage (NCWS) was undertaken to confirm the results of an additional simulation on the use of a stratified cooling tank. From the simulation results and the overall comparison of the selected heat rejection strategies of the LDAC, it was concluded that GSHX system with 25 boreholes showed better COPE than the CWS system whereas the COPT improvement of both systems was almost same. The improved performance of the GSHX however, is expensive as the capital cost for boreholes is higher than the other systems. When comparing the CWS system (with mixed tank) and the SCWS (with stratified tank) it was observed that the stratified tank had the better potential of improving the COPT, depending upon the water flow rate and initial tank temperature.
Download or read book Open Cycle Solid Desiccant Cooling written by Jeff Jerome Jurinak and published by . This book was released on 1982 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt:
